- Dirk Brockmann, a theoretical physicist from Germany, creates a map based on the flow of currency in America that displays where American's travel most in beautiful info-graphs. A 'Whom Do You Hang With?' Map of America. http://www.npr.org/blogs/krulwich/2013/04/16/177512687/a-whom-do-you-hang-with-map-of-america?utm_source=npr&utm_medium=facebook&utm_campaign=20130417 5 comments science
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